package com.dlihaifeng.conversion.platform.gateway.config;

import java.util.ArrayList;
import java.util.List;

import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

/**
 * @author lihaifeng
 */
@Slf4j
@Primary
@Component
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

  private final RouteLocator routeLocator;

  private final GatewayProperties gatewayProperties;

  @Override
  public List<SwaggerResource> get() {
    List<SwaggerResource> resources = new ArrayList<>();
    List<String> routes = new ArrayList<>();
    routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
    gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
        .forEach(route -> {
          route.getPredicates().stream()
              .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
              .forEach(predicateDefinition -> resources.add(swaggerResource(route.getId(),
                  predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                      .replace("**", "v2/api-docs"))));
        });

    return resources;
  }

  private SwaggerResource swaggerResource(String name, String location) {
    log.info("name:{},location:{}", name, location);
    SwaggerResource swaggerResource = new SwaggerResource();
    swaggerResource.setName(name);
    swaggerResource.setLocation(location);
    swaggerResource.setSwaggerVersion("2.0");
    return swaggerResource;
  }
}
